Effective CQI Determination for 5G CIoT Transmission
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Solution Overview
Problem
In 5G communication systems, devices with strict battery life requirements in Cellular Internet of Things (CIoT) often have outdated Channel Quality Indicators (CQIs due to infrequent updates, leading to sub-optimal transmission parameters and potential transmission failures, especially in varying environments.
Innovation Solution
A method for a base station to determine effective CQIs by considering the age of actual CQIs, allowing for the selection of optimal data transmission parameters and requesting updated CQIs from devices to improve reliability, thereby enhancing transmission performance while maintaining battery life constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CQI updates are performed frequently to maintain accuracy, then transmission reliability is improved, but device energy consumption increases
Solution Approach 1:
The patent applies dynamics by making the CQI update frequency adaptive rather than static. The base station dynamically adjusts whether to request updated CQIs from devices based on current transmission conditions, channel variability, and device battery status. This allows the system to switch between frequent updates (when reliability is critical) and infrequent updates (when energy conservation is prioritized), resolving the contradiction between transmission reliability and device energy consumption.
Solution Approach 2:
The patent changes the parameter of CQI update frequency based on system state. Instead of using a fixed update schedule, the base station modifies the update behavior by selectively requesting CQIs from specific devices under specific conditions. This parameter change allows the system to optimize the balance between having accurate CQIs for reliable transmission and minimizing device energy expenditure.
2Use of energy by moving object
If CQI updates are performed infrequently to conserve battery life, then device energy consumption is reduced, but transmission reliability deteriorates
Solution Approach 1:
The system dynamically adjusts CQI update frequency based on current needs. When channel conditions are stable and devices have limited battery, the base station reduces update requests. When transmission reliability becomes critical or channel conditions change significantly, the base station increases update frequency. This dynamic approach resolves the contradiction by allowing the system to operate at different points on the energy-reliability tradeoff curve.
Solution Approach 2:
The base station performs preliminary assessment of channel conditions and device states before deciding on CQI update timing. By predicting when CQI accuracy will become critical for upcoming transmissions, the system can proactively request updates at optimal moments rather than reacting to failures, thus maintaining reliability while minimizing unnecessary energy consumption.
3Productivity
If outdated CQIs are used to reduce signaling overhead, then network efficiency is improved, but transmission performance deteriorates
Solution Approach 1:
The patent applies local quality by treating different devices differently in terms of CQI update frequency. Instead of uniformly updating all devices or none, the base station selectively requests CQIs from specific devices based on their individual channel conditions, battery status, and transmission requirements. This localized approach allows the network to maintain high efficiency overall while ensuring critical transmissions use accurate CQIs.
Solution Approach 2:
The system performs partial CQI updates rather than comprehensive periodic updates. By updating CQIs only for devices where it is currently necessary (partial action), the network achieves good performance without the overhead of universal frequent updates. This selective partial updating resolves the contradiction between network efficiency and transmission performance.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A method for selecting one or more data transmission parameters for transmitting data between the base station and one or more devices includes receiving an actual Channel Quality Indicator (CQI) from a device, determining an effective CQI corresponding to the actual CQI based on the actual CQI and the age of the actual CQI, and selecting one or more data transmission parameters based on the effective CQI. A terminal transmits a first CQI value to a base station, receives a request message for requesting an updated first CQI value from the base station, if a second CQI values corresponding to the first CQI value, which is determined based on the first CQI value and time elapsed since the first CQI value is transmitted, is determined that the lowest value of a plurality of CQI value, transmits the updated first CQI value to the base station.